| @@ -35,6 +35,84 @@ ST_FUNC void gen_le32(int c); · 34 unmodified lines |
| 35 | 35 | #define USING_GLOBALS |
| 36 | 36 | #include "tcc.h" |
| 37 | 37 | |
| 38 | +enum { |
| 39 | + OPT_REG32, |
| 40 | + OPT_REGSET32, |
| 41 | + OPT_IM8, |
| 42 | + OPT_IM8N, |
| 43 | + OPT_IM32, |
| 44 | +}; |
| 45 | +#define OP_REG32 (1 << OPT_REG32) |
| 46 | +#define OP_REG (OP_REG32) |
| 47 | +#define OP_IM32 (1 << OPT_IM32) |
| 48 | +#define OP_IM8 (1 << OPT_IM8) |
| 49 | +#define OP_IM8N (1 << OPT_IM8N) |
| 50 | +#define OP_REGSET32 (1 << OPT_REGSET32) |
| 51 | + |
| 52 | +typedef struct Operand { |
| 53 | + uint32_t type; |
| 54 | + union { |
| 55 | + uint8_t reg; |
| 56 | + uint16_t regset; |
| 57 | + ExprValue e; |
| 58 | + }; |
| 59 | +} Operand; |
| 60 | + |
| 61 | +/* Parse a text containing operand and store the result in OP */ |
| 62 | +static void parse_operand(TCCState *s1, Operand *op) |
| 63 | +{ |
| 64 | + ExprValue e; |
| 65 | + int8_t reg; |
| 66 | + uint16_t regset = 0; |
| 67 | + |
| 68 | + op->type = 0; |
| 69 | + |
| 70 | + if (tok == '{') { // regset literal |
| 71 | + next(); // skip '{' |
| 72 | + while (tok != '}' && tok != TOK_EOF) { |
| 73 | + reg = asm_parse_regvar(tok); |
| 74 | + if (reg == -1) { |
| 75 | + expect("register"); |
| 76 | + return; |
| 77 | + } else |
| 78 | + next(); // skip register name |
| 79 | + |
| 80 | + regset |= 1 << reg; |
| 81 | + if (tok != ',') |
| 82 | + break; |
| 83 | + next(); // skip ',' |
| 84 | + } |
| 85 | + if (tok != '}') |
| 86 | + expect("'}'"); |
| 87 | + next(); // skip '}' |
| 88 | + if (regset == 0) { |
| 89 | + // ARM instructions don't support empty regset. |
| 90 | + tcc_error("empty register list is not supported"); |
| 91 | + } else { |
| 92 | + op->type = OP_REGSET32; |
| 93 | + op->regset = regset; |
| 94 | + } |
| 95 | + } else if (tok == '#' || tok == '$') { |
| 96 | + /* constant value */ |
| 97 | + next(); // skip '#' or '$' |
| 98 | + asm_expr(s1, &e); |
| 99 | + op->type = OP_IM32; |
| 100 | + op->e = e; |
| 101 | + if (!op->e.sym) { |
| 102 | + if ((int) op->e.v < 0 && (int) op->e.v >= -255) |
| 103 | + op->type = OP_IM8N; |
| 104 | + else if (op->e.v == (uint8_t)op->e.v) |
| 105 | + op->type = OP_IM8; |
| 106 | + } else |
| 107 | + expect("constant"); |
| 108 | + } else if ((reg = asm_parse_regvar(tok)) != -1) { |
| 109 | + next(); // skip register name |
| 110 | + op->type = OP_REG32; |
| 111 | + op->reg = (uint8_t) reg; |
| 112 | + } else |
| 113 | + expect("operand"); |
| 114 | +} |
| 115 | + |
| 38 | 116 | /* XXX: make it faster ? */ |
| 39 | 117 | ST_FUNC void g(int c) |
| 40 | 118 | { |